Vue中axios请求 提示has been blocked by CORS policy:....No ‘Access-Control-Allow-Origin‘ header 跨域问题

1.在vue.config.js下添加

 devServer: {
    proxy: {
      '/api': {
        target: 'xxxxxx', // 请求接口地址
        changeOrigin: true,
        pathRewrite: {
          '^/api': ''
        }
      },
    }
  }

2.修改 axios.defaults.baseURL = '/api'